Improved ice content, radiation, precipitation and low-level circulation over the tropical pacific from ECMWF ERA-interim to ERA5

Abstract This study evaluates changes in simulated Pacific climate between two ECMWF re-analyses; the ERA Interim (ERAI) and newest ERA5. Changes Integrated Forecasting System (IFS) possibly sea surface temperature result greatly reduced discrepancies ERA5’s ice water path (IWP), radiative fluxes precipitation relative to satellite-based observational products. IWP shows largest percentage change, increasing by over 300% from ERAI ERA5, due inclusion of falling (snow) that impacts calculation. ERA5 high-cloud fraction are generally anticorrelated as expected with outgoing longwave radiation, having smaller versus CERES observations compared ERAI. Reflected shortwave similarly which appears be both cloud optical depth. Finally, also reduces a longstanding excess GPCP product southern trade winds region Southern intertropical convergence zones. related cooler prescribed temperatures, thereby reducing local moisture supply via suppressing net latent heat flux stronger trade-winds. Compared CERES, similar geographic patterns terms top-of-atmosphere but their magnitudes